OCTCO/OCTF Exit Exam • Set 8 Question 9 of 30

Cargo tanks are not ____ with IG before gas freeing then the concentration of atmosphere will pass through flammable range?

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Direct Answer

Option B: Purged

Before gas freeing cargo tanks with fresh air, tanks containing hydrocarbon vapours must first be purged with inert gas until the hydrocarbon level is below the critical dilution line.

All Options

Crude oil washed

Purged (Correct Answer)

Tank cleaning

Re-inerting

Detailed Explanation & Context

Before gas freeing cargo tanks with fresh air, tanks containing hydrocarbon vapours must first be purged with inert gas until the hydrocarbon level is below the critical dilution line.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Oil and Chemical Tanker Cargo Operations (OCTCO/OCTF).

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